Production of lenticular elements on films



Sept. 27, 1932. G. HEYMER 1,879,237

PRODUCTION OF LENTIOULAR ELEMENTS ON FILMS Filed Jan. 15, 1932 Patented Sept. 27, 1932 UNITED STATES PATENT OFFICE GERD HEYMER, or nnssAu-zmiarex, GERMANY, ASSIGNOR To AGFA ANSCO CORPORA- mom or BINGI-IAMTON, NEW YORK, A CORPORATION or NEW YORK PRODUCTION OF LENTICULAR ELEMENTS 0N FILMS Application filed January 15, 1932, Serial No. 586,826, and inGermany January 20, 1931.

My present invention relates to the production of lenticular films and more particularly to a roller for making the lenticular film embossings.

One of its objects is to provide an improved roller for making lenticular embossings on a film. Further objects will be seen from detailed specification following hereafter, reference being made to the accompanying drawing in which Fig. 1 represents a sectional view of my improved roller, and I Fig. 2 shows a sectional View of another form of my improved roller.

For producing lenticular embossings on films which are used in Berthons system of multi-color photography, for instance, a cylindrical roller comprising a cylindrical core provided with a coil of thin wireis used. This roller, or a positive or a negative produced from the roller is caused to impress the film itself or the casting support of the film and thus produces a relief on the film either directly or when the film is cast on the support.

I have found that certain drawbacks occurring with the use of a cylindrical roller are avoided when giving the core a barrel shaped form slightly bulgingin its middle part. By these means also the middle part of the strip to be impressed which owing to the fact that hanging and bending of the strip is sometimes inevitable, is often left'unimpressed receives its impressions.

The accompanying drawing illustrates two modifications of my invention. In Fig. 1 the core has a slightly barrel shaped form on which the wire having the desired size, for instance a wire having a diameter of 40450, is wound closely and uniformly on the core.

The diameter in the midst of the core may be 100.15 mm., whereas the diameter at the tw ends may be 100 mm.

Fig. 2 shows another form of the core. The I slightly barrel shaped form is replaced by two cones (a) and a cylinder (1)). The cylinder (b) may have a diameter of 100.15 mm. and is preferably shorter than the cones. The diameter of one end of the cones. cor- (b) the diameter of the other end may be 100 mm.

My invention is not limited to the foregoing modifications. For instance, I may provide two or more cones on each side of the middle cylinder. The more cones there are provided, the more the slightly barrel shaped form will be obtained, when reducing the length of the middle cylinder correspondingly. The difierence of diameter of the middle cylinder and the ends of the core is only given by Way of example; it may be changed at will.

lVhat I claim is:

1. A roller for making lenticular embossings on films which comprises a core having a raised surface and a wire coil Wound there- 2. A roller for making lenticular emboss-. V

ings on films which comprises. a core having a slightly barrel shaped surface and a wire coil wound thereon.

3. A roller for making lenticular embossings of films which comprises a core having a middle cylinder and adjacent to both ends of this cylinder a cone reducing in size, and a wire coil wound on the core.

4. A roller for making lenticular embossings on films which comprises a roller having a slightly barrel shaped form bulging of about 0.15 mm. with regard to both of its ends, and a wire coil wound on the core.

5. A roller for making lenticular'embossings on films which comprises a core having a middle cylinder of about 100.15 mm. and adjacent to both ends of this cylinder a cone which is longer than the cylinder and reduces in size so as to have at itsother end a diameter of about'lOO mm., and a wire coil wound on the core.

In testimony whereof, I aifix my signature.

' GERD HEYMER.

responds obviously to that of the cylinder 

